<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <title>Insert title here</title>
</head>
<body>
<form action="<%=response.encodeURL("loginServlet")%>" method="post">
  用户名：<input type="text" name="username">
  <input type="submit" value="登录">
</form>
</body>
</html>